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P. E. MALMSTROM.

SPRING ROLLER FORGURTAINS.

(N6 Model.)

Patented Aug. 11, 1885.

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bv W Y WITNESSES:

ATTORNEYS N. PETERS. F'hoto-lnhogrnpmn Wnhinglm D. C.

UNITED STATES PATENT OFFICE.

PETER E. MALMSTROM, OF BROOKLYN, NEW YORK.

SPRING-ROLLER FOR CURTAINS.

SPECIFICATION forming part of Letters Patent No. 324,135, dated August 11, 1885;

Application filed August 14, 1884.

To all whom it may concern:

Be it known that I, PETER E. MALMsTRoM, a citizen of the United States, residing at Brooklyn, (Greenpoint,)in the county of Kings and State of New York, have invented new and usefullmprovements in Spring-Rollers for Ourtains, of which the following is a specification.

This invention relates to a fixture for shaderollers, which is composed of a casing, a stationary axle extending through the casing, a drum which revolves freelyon this axle, a convolute spring, one end of which is secured to the stationary axle,while its other end is fast ened to the interior of the drum, a revolving shaft which has its bearings in the heads of the casing, a square, polygonal, or oval stem extending from said shaft through the. casing, a

take-up roller the diameter of which is smaller" than that of the drum, and which is made integral with or mounted firmly 011 this shaft, a

tape or flexible strip of sheet metal,which extends several times round the drum, and has one end fastened to the circumference of the drum and its other end to the take-up roller,

one or more notches formed in the take-up 'roller, and a click mounted in such a position that it bears upon the circumference of said roller, so that when the square stem is introduced into a corresponding socket in the end of a shade-roller and the shade is pulled down, the spring is slowly wound up and retainedin this position by the click, provided the movement of the shade is slow; but if the shade is moved fast the click is released, so as to permit the shade to rewind on its roller by the action of the convolute spring, the principal advantage of my fixture being based upon the difference in the diameter of the take-up roller and of the drum, which is of such a nature same in the plane y 1 Fig. 1. Fig. 4 is a see tional end view of the shade-roller, the plane of section beingindicated by the'linezz, Fig. 3.

(No model.)

Similarlettersindicate corresponding parts. In the drawings, the letter A designates the casing, which is made of brass or any other suitable material, and which is so constructed that it can be readily put up in the required position. In this case is firmly mounted an axle, B, on which turns a drum,O,which contains the convolute spring D, one end of this spring being secured to the axle and the other to the drum. On the circumference of the drum is firmly secured one end of a tape or flexible strip of sheet metal, E, which is wound round the drum several times, and the other end of which is fastened to a roller, F, which is firmly mounted on or made integral with a rotary shaft, G. This shaft has its bearings in the heads of the casing A, and it is provided with an extension, H, the cross-section of which is square, polygonal, or oval. In the interior of the casing is situated a click, I, which swings loosely on its pivot to, and which bears upon the circumference of the roller by its own gravity, if the casing is put up in its working position, so that it drops in gear with one or more notches, b b, formed in one end of therol ler,provided the shaft is revolved slowly. The extension H of the shaftGfits into a socket, 0, in a metallic plate, J, which is fastened to one end of theshade-roller K. The diameter of the rollerF is considerably smaller than that of the drum, so that if the shade,which is secured on the roller K, is drawn down, the drum 0 makes only one revolution for every four or more) revolutions of the shaft G, and consequently the tension of the spring D undergoes comparativelylittle change by the operation of the shade, and it is not liable to get out of order for a long time.

What I claim as new, and desire to secure by Letters Patent is- A fixture for shade-rollers composed of a casing, a stationary axle fixed in said casing, a drum which revolves freely on this axle, a convol-ute spring, one end of which is secured to the stationary axle, while its other end is fastened to the interior of the drum, a revolving shaft which has its bearings in the heads of the casing, a square, po]ygonal,or oval stem extending from said shaft through the casing, a take up roller the diameter of which is smaller than that of the drum, and which is made integral with 01 mounted firmly on the In testimonywllereofllmve hereunto set my in shaft, a tape or flexible strip of sheet metal hand and seal in the preseneeof two snbscribextending several times round the drum, and int: witnesses.

having one 011dllIStCIJOLltl1OFCtO,\\'llll0 its other end is fastened to the take-n1) roller, one 01' PETER E. MALMQTROM. more notches 'lormedin the take-11 ]Oll0l,ll1(l a click which bears upon the circumference of Witnesses:

thetake-np roller, all construct-ed substantially PAUL E. DUMAIER,

as and for the purpose shown and described. I E. 11. KAsTnNnUnnn. 

